Voice of the Whistler

Richard Dix

John Sinclair / John Carter

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Lynn Merrick

Joan Martin Sinclair

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Rhys Williams

Ernie Sparrow

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James Cardwell

Fred (Doc) Graham

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Tom Kennedy

Ferdinand / Hammerlock

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Sam Ash

Gibson Motor Car Co. Executive (uncredited)

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Egon Brecher

Dr. Rose (replaced by Frank Reicher) (uncredited)

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Charles Coleman

Sinclair's Butler (uncredited)

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Otto Forrest

The Whistler (uncredited)

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Byron Foulger

Georgie (uncredited)

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